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  Friction regulator for lubricating oil and lubricating oil compositionRelated Patent Categories: Solid Anti-friction Devices, Materials Therefor, Lubricant Or Separant Compositions For Moving Solid Surfaces, And Miscellaneous Mineral Oil Compositions, Lubricants Or Separants For Moving Solid Surfaces And Miscellaneous Mineral Oil Compositions (e.g., Water Containing, Etc.), Organic Phosphorus Compound, Wherein The Phosphorus Is Single Bonded Directly To Chalcogen By Nonionic Bonding (e.g., Phosphorus Acids, Esters, Etc.), Additional Phosphorus Attached Directly Or Indirectly To The Phosphorus By Nonionic BondingThe Patent Description & Claims data below is from USPTO Patent Application 20060105924. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to a friction modifier for lubricating oils, and a lubricating oil composition. [0002] More particularly, the present invention relates to a friction modifier for regulating the friction coefficient of lubricating oils for automobiles, a friction modifier composition, and a lubricating oil composition. BACKGROUND ART [0003] Conventionally, to lubricating oils for automobiles, a fatty acid amide or a fatty acid ester of oleyl amine and diethanolamine (U.S. Pat. No. 4,208,293), etc. are added as a friction modifier for reducing a shock of friction at the time of changing gear. SUMMARY OF THE INVENITON [0004] The present invention has for its object to provide a friction modifier capable of giving an improved torque transmission function to lubricating oils for automobiles. [0005] Another object of the present invention is to provide a friction modifier capable of giving a shock reducing function at the time of changing gear to lubricating oils for automobiles. [0006] Additional object of the present invention is to provide a lubricating oil for automobiles having a shock reducing function at the time of changing gear as well as an improved torque transmission function. [0007] Further object of the present invention is to provide a lubricating oil for automobiles capable of saving fuel. [0008] Much further object of the present invention is to provide a transmission oil, power-steering oil, shock absorber oil, traction oil or grease having a shock reducing function at the time of changing gear as well as an improved torque transmission function. [0009] According to the present invention, the above-mentioned objects can be attained by a friction modifier for a lubricating oil which comprises an oil-soluble copolymer (A) containing at least one unit of a monomer (a) represented by the general formula (1) and at least one unit of a monomer (b) represented by the general formula (2), and having a weight average molecular weight of 3,000 or more. CH.sub.2.dbd.C(R.sup.1)-Q-(Z-A.sup.1).sub.m-X (1) CH.sub.2.dbd.C(R.sup.3)--CO--(O-A.sup.2).sub.n-OR.sup.4 (2) [0010] In the above formulas (1) and (2), X is a polar group represented by the formula --PH.sub.2, --NH.sub.2 or --(O).sub.a--P (.dbd.O).sub.b(OR.sup.2).sub.2 wherein either a or b is 1, and the other is 0 or 1. Two R.sup.2s are the same or different and each represents H, an alkyl group having 1 to 24 carbon atoms, a group represented by the formula -(A.sup.1-Z).sub.m-Q-C(R.sup.1).dbd.CH.sub.2 or M.sub.1/f (M is a f valent cation, and f is 1 or 2). R.sup.1 represents H or a methyl group, Z represents --O-- or --NH--, A.sup.1 represents an alkylene group having 2 to 18 carbon atoms, and m represents an integer of 0, 1 or 2 to 50. Q represents --CO-- or a divalent hydrocarbon group having 1 to 22 carbon atoms, and when m is 0, Q represents a divalent hydrocarbon group having 1 to 22 carbon atoms. R.sup.3 represents H or a methyl group, n represents an integer of 0 or 1 to 30, and A.sup.2 represents an alkylene group having 2 to 18 carbon atoms. R.sup.4 represents an aliphatic hydrocarbon group having 1 to 32 carbon atoms, an alicyclic hydrocarbon group having 5 to 7 carbon atoms, or an aralkyl group having 7 to 32 carbon atoms. When there are a plurality of A.sup.1, Z, Q, R.sup.1, m and A.sup.2, each of them may be the same or different. DETAILED DESCRIPTION OF THE INVENTION [0011] The copolymer (A) has a weight average molecular weight (hereinafter, abbreviated as Mw) of generally 3,000 or more, preferably 3,000 to 500,000, more preferably 5,000 to 300,000, particularly preferably 8,000 to 100,000, and most preferably 10,000 to 35,000. In the present invention, Mw is determined as a polystyrene conversion molecular weight by gel permeation chromatography (GPC). [0012] Moreover, the copolymer (A) is oil-soluble. In this specification, "oil-soluble" means a nature that at least 1 g of a substance is uniformly dissolved in 100 g of mineral oils (mineral oils having a kinetic viscosity of 2.3 mM.sup.2/s at 100.degree. C., and viscosity index of 83) at 40.degree. C. Preferably, 5 g or more of the copolymer (A) is dissolved. [0013] In the formula (1), among R.sup.2 in the case where X is --(O).sub.a--P (.dbd.O).sub.b(OR.sup.2).sub.2, alkyl groups having 1 to 24 carbon atoms (hereinafter, abbreviated as C) include, for example, methyl, ethyl, n- and iso-propyl, n-, iso-, sec- and tert-butyl, n-, iso-, sec- and neopentyl, hexyl, heptyl, n- and iso-octyl, 2-ethylhexyl, n- and iso-nonyl, n- and iso-decyl, n- and iso-dodecyl, n- and iso-tridecyl, n- and iso-tetradecyl, n- and iso-pentadecyl, n- and iso-hexadecyl, n- and iso-octadecyl, n-eicosyl, 2-ethyloctadecyl, 2-hexyltetradecyl, 2-octyldodecyl, docosyl, n-tetracosyl, and 2-decyltetradecyl groups. In view of the friction regulation effect of (A), preferred are C1-4 alkyl groups, and particularly preferred are methyl and ethyl groups. [0014] The f valent cations M (f is 1 or 2) include H (proton), alkali metal cation, alkaline earth metal cation, NH.sub.4, organic amine cation, quaternary ammonium cation, and combined use of two or more species of these. [0015] Alkali metals constituting the cation include lithium, sodium, potassium, etc.; alkaline earth metals include calcium, magnesium, etc.; [0016] Organic amines include primary, secondary and tertiary aliphatic amines (amines containing C1-20 alkyl group and/or C2-4 hydroxyalkyl group: diethylamine, triethylamine, monoethanol amine, monopropanol amine, etc.), alicyclic amines (cyclohexyl amine, dicyclohexyl amine, etc.), aromatic amines (aniline, toluidine, etc.), aromatic heterocyclic amines (pyridine, quinoline, etc.), heterocyclic amines (morpholine, N-methylmorpholine, piperazine, etc.); C2-4 hydroxyalkyl substitution product of N-position of these cyclic amines (N-hydroxyethyl morpholine, etc.); quaternary ammoniums include aliphatic and alicyclic quaternary ammonium, e.g. tetra(cyclo) alkylammonium [having C1-12 alkyl groups (methyl, ethyl, propyl, butyl, hexyl, octyl, dodecyl groups, etc.) and/or cycloalkyl groups (cyclohexyl group, etc.); four (cyclo)alkyl groups may be the same or different]. A (cyclo)alkyl group represents an alkyl group and/or cycloalkyl group, and hereinafter, the same expression is used. [0017] Preferred among the cations is an organic amine cation, and particularly preferred is an aliphatic amine cation in view of oil solubility of (A). [0018] As Q, Z, and A.sup.1 in the case where R.sup.2 is -(A.sup.1-Z).sub.m-Q-C(R.sup.1).dbd.CH.sub.2, there may be mentioned the following. [0019] Divalent hydrocarbon groups having 1 to 22 carbon atoms of Q include straight chain and branched aliphatic hydrocarbon groups (e.g. methylene, ethylene, 1,2-propylene, 1,3-propylene, 1,2-butylene, 1,3-butylene, 1,4-butylene, 1,2-hexylene, 1,6-hexylene and 1,2-dodecylene groups), alicyclic hydrocarbon groups (e.g. cyclohexylene, cyclohexyl methylene, cyclohexyl ethylene, and cyclooctyl hexylene groups), and aromatic hydrocarbon groups (e.g. phenylene, phenylmethylene, phenylethylene, phenylhexylene, phenylbismethylene, and phenylbisethylene groups). Among these hydrocarbon groups, preferred are C1-10 ones, and particularly preferred are C1-2 ones. [0020] Preferred among Q is an aliphatic hydrocarbon group (particularly a methylene group), and particularly preferred is --CO-- in view of production easiness of the copolymer having a desired Mw. [0021] Z is preferably --O-- in view of production easiness of the monomer. Continue reading... Full patent description for Friction regulator for lubricating oil and lubricating oil composition Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Friction regulator for lubricating oil and lubricating oil composition patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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